Abstract: A device for draining a liquid from a first film layer which forms at least one part of a building cladding element. A first valve element can be arranged in the region of a first opening of the first film layer such that the valve element can be pivoted between a first position, which closes the first opening, and a second position, which at least partly releases the first opening. Additionally, a first opening and closing are configured to keep the first valve element in the first position if pressure of a liquid is less than or equal to a threshold, allow the first valve element to pivot from the first position to the second position if the pressure of the liquid exceeds the threshold, and pivot the first valve element from the second position to the first position if the pressure is substantially no longer present.

Abstract: Described is a building encasement element (100) with a foil cushion that comprises an outer foil layer (101) forming the outside of a building envelope and an inner foil layer (102) forming the outside of a building envelope, wherein these foil layers form, between themselves, at least one essentially fluid-tight, enclosed hollow space in which a fluid medium, in particular, air, is contained, and with a reinforcement element (107).